How does routing work in ASP.NET Core?

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Routing in ASP.NET Core is the process that maps incoming HTTP requests to corresponding controller actions or endpoints. It determines how URLs are handled by the application.

How Routing Works:

  1. Route Definition:
    Routes define patterns to match URLs. They specify parameters (e.g., {controller}, {action}, {id}) that are extracted from the URL.

  2. Middleware Setup:
    Routing is configured in the Startup.cs file using middleware like UseRouting() and UseEndpoints().

  3. Request Matching:
    When a request comes in, the routing middleware compares the request URL against registered route patterns.

  4. Route Data Extraction:
    If a match is found, route parameters are extracted and passed to the target controller/action or endpoint.

  5. Endpoint Execution:
    The matched endpoint processes the request and returns a response.

This means a URL like /Products/Details/5 maps to:

  • Controller: Products

  • Action: Details

  • Parameter: id = 5

Types of Routing:

  • Conventional Routing: Uses predefined route templates, typically in MVC apps.

  • Attribute Routing: Routes are defined using attributes directly on controllers and actions:

Summary:

Routing in ASP.NET Core translates URLs into executable code by matching patterns to controllers/actions or endpoints, enabling clean and flexible URL design in web applications.

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